EESA06H3 Chapter Notes - Chapter 20: Taconic Orogeny, Grenville Orogeny, Alleghanian Orogeny
Document Summary
Canada: a young nation, but an old country. Canada has been in existence since 1867: act of confederation brought together ontario, nb, ns, and quebec, last to join was newfoundland in 1949. Na continent was assembled by plate tectonics processes that brought together many smaller land masses: process of continental building has taken more than 4 billion years. Construction of na began at least 4000 million years ago with formation of. Acasta gneiss of northwest territories (slave province of canadian shield) Na was complete by 65 million years ago: modern landscape is result of glaciation in last 2. 5 million years, last ice sheet left 12000 years ago and melted in labrador 6000 years ago. Northern part of continent is underlain by exposed part of ancient core or craton of na: called canadian shield and consists of old archean and proterozoic rocks. Craton is composed of several geologic provinces. Provinces and sub provinces are now widely recognized to be terranes.
